CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 14, Issue 10,2005, Pages 725-728, doi:10.3760/j.issn:1004-4477.2005.10.001
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 14, Issue 10,2005, Pages 769-773, doi:10.3760/j.issn:1004-4477.2005.10.014
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